Pumps



K. R. LUNG PUMPS Filed May 17, 1956 Sept. 1, 1959 ATTORNEYS UnitedStates Patent Manufacturing Company, Dayton, Ohio, a corporation of OhioApplicatiqn May 17, 1956,seri1N0.5s5,559 3 claims. (ci. 10s-5) Thisinvention relates to centrifugal pumps and more particularly to -acentrifugal pump for use in conjunction with a jet pump to 4form acentrifugal-jet pumping system.

It is a primary object of the invention to provide a. centrifugal-jetpumping system which is readily convertible for either shallow or deepwell use, and especially to provide a centrifugal pump for inclusion insuch system which is of improved and novel construction affordingunusual ability to operate effectively and eiciently even underconditions of a substantial proportion of air in the liquid beingpumped.

It is therefore an object of the invention to provide a centrifugal pumpfor use in conjunction with a jet pump as outlined above wherein thepump casing includes an inlet chamber for connection wit-h the dischargeside of the jet pump which is of such construction and arrangement as toassure that any air discharged by the jet pump will be transmitted tothe impeller of the centrifugal pump and cannot remain in the line whereit could cause a possible air lock.

Another object of the invention is to provide a centrifugal pump asoutlined above wherein the pressure port for connection of the nozzleofthe jet pump is so located with respect to the diffuser passages lfromthe pumping `chamber wherein the centrifugal impeller operates as toassure maximum freedom from air for the liquid supplied under pressureto the jet pump nozzle.

It is also an object of the invention to provide a centrifugal pumphaving the structural and operational characteristics outlined abovewherein the ports for connection to the jet pump are on the side of thecentrifugal pump casing for ready access with minimum requirements ofoverall length.

Additional objects and advantages of the invention will be apparent fromthe following description, the accompanying drawing and the appendedclaims.

In the drawing- Fig. l is a view partly in side elevation and partly inl vertical section on the line 1-1 of Fig. 2 showing a centrifugal pumpconstructed in accordance with the invention;

Fig. 2 is a section on the line 2-2 of Fig. 1 and showing a pumpingsystem for shallow well operation;

Fig. 3 is a detail view looking toward the back of the pump body or-main casing of the pump of Fig. 1, the view being partly in elevationand partly broken away to illustrat-e details of internal construction;and

Fig. 4 is a front elevational view showing a pumping I system inaccordance with the invention for deep well use.

Referring to the drawing, which illustrates a preferred embodiment ofthe invention, the electric drive motor 10 is bolted to a bracket 11which is shown as of essentially the same construction disclosed in mycopending application Serial No. 482,605, led January 18, 1955, `andissued as Patent No. 2,836,124 on May 27, 1958, to the same assignee asthis application. The drive motor shaft ICC 12 projects through a borein the opposite side of the bracket 11 from motor 10, `and 'this shaft12 carries a centrifugal impeller 13. The junction between the shaft 12and bracket 11 is provided with a rotary seal indicated generally at 15as `also described in detail in my above copending application.

The main pump body 20 is also bolted to the bracket 11 at 21 andencloses the discharge chamber 22 for receiving the output of theimpeller 13. The casing 20 includes an imperforate front wall 23 whichoverlies the discharge chamber 22, and the rear wall 24 of the casingforms the front of the pumping chamber 25 in which the impeller 13operates. The wall 24 is provided with a centrally located inlet opening26 therethrough with which the inlet 27 of the impeller registers, andthis inlet opening 26 is surrounded by a cylindrical boss portion 28 ofthe wall 24.

The casing 20 also -includes an intermediate wall 30 which extends fromside to side entirely across the discharge chamber 22 and cooperateswith the back wall 24 to dene an inlet or suction chamber 31 entirelyseparate `from the `discharge 22. This inlet chamber 31 overlies theinlet opening 26 to the impeller, and the wall 30 is so propo-rtioned asto locate this opening in registry 'with the uppermost portion of theinlet chamber. Thus as best seen in Fig. 2, the upper portions of thewall 30 are integral with the upper p-art of the boss 28 and divergedownwardly therefrom, and the lower portion of the wall 30 is spacedbelow the boss 28 so that a substantial portion of the chamber 31 liesentirely below the inlet opening 26.

On one side of the casing 20, there is provided a port 33 which formsthe inlet to the inlet chamber 31. Below the port 33 on the same side ofthe casing is a port 35 which opens into the lowermost portion of thedischarge cham-ber 22. At the opposite side of the casing 20 from theport 33 is a bore 36 which is provided primarily for convenience incasting the casing, and while it may be used for cleaning purposes afterthe pump has been used, it is normally closed by a plug 37.

The ports 35 and 33 are respectively the .pressure and suction ports forconnection with the nozzle and the discharge side of the jet pump, andthe side portion of the casing surrounding these ports is `formed toprovide a boss 39 for directly receiving the jet pump housing 40 thereonas shown in Fig. 2 when the combination is to be used for shallow welloperation. This housing 40 carries therein the jet nozzle 41 andcooperating Venturi tube 42 which projects through the port 33 into theinterior of the inlet chamber 31 to deliver the discharge from the jetpump to the chamber 31. The pressure port 35 similarly connects directlywith the passage 43 within the jet housing 40 which' leads to the nozzle41, and the suction chamber 44 of the jet is connected by a suction line45 to the well or other source of liquid to be pumped.

Fig. 3 best illustrates the arrangement of the diffuser passages 50within the casing 2t) by which the liquid travels from the impeller 13and the pumping chamber 25 to the discharge chamber 22. There are two ofthese passageways 50 which are cast in the casing 20 and defined in partby rib-like portions 51 between the inner and outer portions of the wall24, and the front wall of each of the diffuser passageways is formed bya web portion 52 of the casing 20. Each of these diffuser passageways 59terminates at its discharge end in a port 55 extending through the web52 into the discharge chamber 22, .and Pig. 3 shows that these ports 55are is connected to the casing 20- through a boss `6]; adjacent theupper opposite corner of the casing from the discharge port 35. Withinthis boss is a vertical wall 62 forming a chamber 63. separate from theychamber 22 and connected therewith by a passage 65 through the wall 62.An adjustable valve 66 extends through the front wall of the casing forcooperation with the passage 654 to restrict the discharge from chamber22 and thereby to maintain proper pressure within the chamber foroperation of the jet pump. The plug 67 closes. a port in the top of thechamber 22. for priming the pump.

In shallow well operation, the jet pump; housing 4.01 is mounted oncasing 20 as described inconnection with Fig. 2, and the pressuredeveloped by the dischargel from the impeller in the pumping chamber 25is supplied to the jet nozzle 4l to develop suction in the chamber andline 45, and the discharge from the jet pump venturi 42 is supplieddirectly to the inlet chamber 3l for transmission to the inlet of theimpeller. Since the pressure port 35 is located adjacent the bottom ofthe chamber 22 and also since the ports 55 which connect the diffuserpassages with the chamber 22 are located at substantially the maximumdistances for both thereof away from pressure port 35, any air which maybe present in the liquid has the maximrun opportunity for separationfrom the liquid before the latter reaches port 35. This constructiontherefore provides assurance that substantially air-free liquid will besupplied to the jet nozzle 4d. Similarly, with the intermediate wal-l 35constructed as described to locate the inlet opening 26 at the top ofthe chamber 3l and at substantially the apex of the inclined upperportions of the wall 30, any air entering the chamber 3i from the jetpump will be directed into the opening 26 for further transmission tothe chamber 22 and ultimately to the discharge line 60, and it cannotremain in the chamber 31 to cause a possible air lock. This result isfurther facilitated by the location of the port 33 with its axis spacedwell below the opening Z5 since this arrangement also facilitatesseparation of air Within chamber 3l for assured passage to and throughthe inlet opening 26.

Fig. 4 shows the manner of assembling a pumping system in accordancewith the invention for deep well operation. Instead of mounting the jetpump housing 40 directly on the casing, it is connected thereto by pipes7) and 7l which in turn are connected with the ports 33 and 35respectively by means such as a coupling 72 which may be of the typedisclosed in my copending application Serial No. 437,515, led lune 17,1954, and issued as Patent No. 2,786,417 on March 26, 1957, to the sameassignee as this application. Otherwise, the mode of operation of thedeep well pumping system of the invention is essentially the same as forthe shallow well operation already described, and the same practicaladvantages are obtained as inl shallow well operation.

While the forms of apparatus herein described constitute preferredembodiments of the invention, it is to be understood that the inventionis not limited to these precise forms of apparatus, and that changes maybe made therein without departing from the scope o f the invention whichis defined in the appended claims.

What is claimed is:

1. in a centrifugal pump of the character described for use inconjunction with a jet pump including a nozzle and a Venturi tube, apump casing enclosing a discharge chamber and including an imperforatefront wall overlying said discharge chamber, means for supporting saidcasing in a horizontally extending operating position with saiddischarge chamber located at the front thereof, a back wall in saidcasing defining the front of a pumping chamber and having a centrallylocated inlet opening therethrough, an impeller supported in saidpumping chamber on a horizontal axis with the inlet thereof registeringwith said opening, an intermediate wall extending laterally across theinterior of said discharge chamber in rearwardly spaced relation fromsaid front wall and cooperating with said back wall to deiine an inletchamber entirely separate from said discharge chamber and overlying saidopening, means forming a pressure port leading laterally from saiddischarge chamber below said intermediate wall for connection to saidjet pump nozzle, means forming an inlet port to said inlet chamberlocated directly above and parallel with said pressure port forconnection with the output side of said jet pump to conduct thedischarge therefrom to said inlet chamber, means forming a dischargeport from said discharge chamber located above said intermediate wall,means form-ing a pair of diffuser passages each extending substantiallyaround the periphery of said pumping chamber, and means forming aconnecting passage from each said diffuser passage to said dischargechamber and located respectively adjacent the top of said dischargechamber and adjacent the opposite side thereof from said pressure portto minimize access to said pressureport of air in they liquid beingpumped.

2. In acentr-'ifugal pump of the character described for use inconjunction with a jet pump including a nozzle and` a venturi tube, apump casing enclosing a discharge chamber and including an imperfora-tefront-wall overlying said discharge chamber, means for supporting saidcasing in a horizontally extending operating. position with saiddischarge chamber located at the front thereof, a back wall in saidcasing defining the front of a pumping chamber and having a centrallylocated annular boss defining an inlet opening therethrough, an impellersupported in said pumping chamber onl a horizontal axis with the inletthereof registering with said opening, an intermediate wall extendinglaterally across the interior of said discharge chamber in rearwardlyspaced relation from said front wall and cooperating 'with said backwall to define an inlet chamber entirely separate from said dischargechamber and overlying said opening, said intermediate wall beingproportioned to locate said opening in. registry with the uppermostportion of said inlet charnber and to provide a substantial portion ofsaid inlet chamber lying entirely below said opening, means forming apressure port leading laterally from said discharge chamber below saidintermediate wall for connection to said jet pump nozzle, means formingan inlet port to said inlet chamber located above and parallel with saidpressure port and below the level of said inlet opening for connectionwith the output side of said jet pump to conduct the discharge therefromto said inlet chamber, and the upper portions. of said intermediate wallbeing integral with and diverging downwardly from said boss to assurepassage to and through said opening of all air entering said inletchamber.

3. In a centrifugal pump of the character described for use inconjunction with a jet pump including a nozzle and a venturi tube, apump casing enclosing a discharge chamber andv including an imperforatefront wall overlying said discharge chamber, means, for supporting saidcasing in a horizontally extending operating position with saiddischarge chamber located at the front thereof, a back wall in said:casing definingl the front of a pumping chamber and having a centrallylocated annular boss defining an inlet opening therethrough, an impellersupported in said pumping chamber on a horizontal axis with the inletthereof registering with said opening, an intermediate wall extendinglaterally across the interior of said discharge chamber in rearwardlyspaced relation from said front wall and cooperating with said back wallto define an inlet chamber entirely separate from said discharge chamberandV overlying said opening, said intermediate wall being proportionedto locate said opening in registry with. the uppermost portion of saidinlet chamber and to provide a: substantial portion of said inletchamber lying entirely belowy said opening, means formingy a pressureport leading laterally from said discharge chamber below saidintermediate Wall for connection to 5 said jet pump nozzle, meansforming an inlet port to said inlet chamber located above and parallelwith said pressure port and below the level of said inlet opening forconnection with the output side of said jet pump to conduct thedischarge therefrom to said inlet chamber, the upper portions of saidintermediate wall being integral with and dverging downwardly from saidboss to assure passage to and through said opening of all air enteringsaid inlet chamber, means forming a discharge port from said dischargechamber located above said intermediate Wall, means forming a pair ofdiffuser passages each extending substantially 180 around the peripheryof said pumping chamber, and means forming a connecting passage fromeach said diffuser passage to said discharge chamber and locatedrespectively adjacent the top of said discharge chamber and adjacent theopposite side thereof from said pressure port to minimize access to saidpressure port of air in the liquid being pumped.

References Cited in the ile of this patent UNITED STATES PATENTS2,319,230 Harrington May 18, 1943 2,335,109 Conery Nov. 23, 19432,375,571 Mann May 8, 1945 2,452,874 Shallenberg Nov. 2, 1948 2,474,539Mann June 28, 1949 2,479,969 Schleyer Aug. 23, 1949 2,619,036 Mann Nov.25, 1952 2,632,393 Tinker Mar. 24, 1953 2,657,641 Lung Nov. 3, 1953

